incorrect cohomological shift for modules
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package issue
- Dominant language
- Macaulay2
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- 435
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- 297
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Description
```m2
i1 : needsPackage "Complexes";
i2 : S = QQ[x];
i3 : S^1[1]
1
o3 = S
1
o3 : Complex
i4 : (complex S^1)[1]
1
o4 = S
-1
o4 : Complex
```
cc: @mikestillman @ggsmith
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reproducing the `Complexes` package examples in the issue, especially `S^1[1]` and `(complex S^1)[1]`. Trace how the package represents and applies cohomological shifts, then verify that both expressions produce the intended degree convention and add or update a regression test if the relevant test location can be found.
Written by the indexing model from the issue text.
Assessment
- Domain
- tooling
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Quiet
- Clarity
- Mostly clear
- Newbie friendliness
- 45/100